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Issue 12 | Dec 1974 | pp. 1049-1144

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Volume 1

Select this Article		A demonstration model of magnetic resonance H. S. Sandhu and H. Peemoeller American Journal of Physics -- December 1974 -- Volume 42, Issue 12, pp. 1057 Online Publication Date: Jul 2005 Full Text: \| Download PDF
	+ -	Show Abstract A simple and inexpensive model to demonstrate the pulsed magnetic resonance phenomenon is described. It can be easily constructed in an undergraduate laboratory and can provide a direct demonstration of the precessional motion of a magnetic moment in a steady magnetic field. The decay of the signal induced by the precessing magnetic moment can be displayed on an oscilloscope. The model is quite suitable for demonstration in a classroom.

Select this Article		Orientation for the new teaching assistant—A laboratory based program Jacqueline Spears and Dean Zollman American Journal of Physics -- December 1974 -- Volume 42, Issue 12, pp. 1062 Online Publication Date: Jul 2005 Full Text: \| Download PDF
	+ -	Show Abstract A traditional part of the “education” of a physics graduate student is facing his first class as a teaching assistant. Unfortunately, the most the new teaching assistant learns from this encounter is how little he knows about teaching. The laboratory instructors orientation program at Kansas State University offers the instructors an opportunity to see some of the problems he will face and some methods for handling them before he begins teaching. The program, which includes introductions to Transactional Analysis and Piaget's theory of intellectual development, is based on laboratory experiences undertaken by the new instructor before classes begin.

Select this Article		The Determination of the Muon Magnetic Moment from Cosmic Rays C. Amsler American Journal of Physics -- December 1974 -- Volume 42, Issue 12, pp. 1067 \| Cited 1 time Online Publication Date: Jul 2005 Full Text: \| Download PDF
	+ -	Show Abstract A simple experiment suited for use in an advanced laboratory course in particle physics is described. The magnetic moment of cosmic ray muons which have some polarization is determined with an error of about ±5% after ten days of running.

Select this Article		Dispersion Relations for Optically Active Media W. P. Healy and E. A. Power American Journal of Physics -- December 1974 -- Volume 42, Issue 12, pp. 1070 \| Cited 1 time Online Publication Date: Jul 2005 Full Text: \| Download PDF
	+ -	Show Abstract The simple well-known form of the Kramers-Krönig dispersion relation that connects the real part of the refractive index with the absorption coefficient in a medium must be modified if the medium is optically active. It is most enlightening to make the correct generalization because the point of departure from the derivation of the conventional dispersion relation involves the subtle analysis of crossing symmetry used mostly in high energy particle physics. An interrelation between the very familiar physical theory for the refractive index of a dilute medium and crossing symmetry is clearly of pedagogical interest especially so when the phenomena involved are basic tools in chemistry, namely optical activity and circular dichroism. The modified dispersion relation leads to the correct relationship between the optical rotary power and the differential absorption in circular dichroism for the medium. Finally it is shown that the Rosenfeld-Condon expression for optical rotary power follows from a sharp line approximation for the absorption coefficients.

Select this Article		A Visual Demonstration of Two-Dimensional Electrostatic Fields F. S. Chute and F. E. Vermeulen American Journal of Physics -- December 1974 -- Volume 42, Issue 12, pp. 1075 Online Publication Date: Jul 2005 Full Text: \| Download PDF
	+ -	Show Abstract Concurrently with the recently published work of Jones and Vacanti, the authors have developed a similar method for providing visual displays of electrostatic fields. However the preparation of the displays is somewhat different and leads, the authors believe, to higher quality reproductions. The purpose of the present note is to describe the method which utilizes the familiar field-mapping technique using resistive paper (teledeltos) and the thermal properties of cholesteric liquid crystals. As well some of the displays are presented here to demonstrate the effectiveness of this new electrostatics teaching aid.

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Dec 1974

Volume 42, Issue 12, pp. 1049-1144

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Select this Article		The Robert A. Millikan Lecture Award 1974 E. Leonard Jossem American Journal of Physics -- December 1974 -- Volume 42, Issue 12, pp. 1049 Online Publication Date: Jul 2005 Full Text: \| Download PDF
		Abstract Unavailable

Select this Article		Recollections of physics and of physicists during the 1920's David M. Dennison American Journal of Physics -- December 1974 -- Volume 42, Issue 12, pp. 1051 \| Cited 1 time Online Publication Date: Jul 2005 Full Text: \| Download PDF
		Abstract Unavailable

Select this Article		Determination of the Runge-Lenz Vector W. H. Heintz American Journal of Physics -- December 1974 -- Volume 42, Issue 12, pp. 1078 \| Cited 3 times Online Publication Date: Jul 2005 Full Text: \| Download PDF
	+ -	Show Abstract A procedure is demonstrated for determining the Runge-Lenz vector for the non-relativistic, classical Kepler problem. This vector constant of the motion enables one to determine the orbit of the particle in a simple way. It is also useful in finding the quantum mechanical solutions for this problem and for systematically studying the symmetry characteristics involved. This article, however, stresses only the classical aspects. The method used can, with appropriate modification, be applied to other problems.

Select this Article		Generalized Bernoulli Construction—A Heuristic Approach to the Equation of State Fernando Del Rio, Esteban Martina, and Miguel Leiva American Journal of Physics -- December 1974 -- Volume 42, Issue 12, pp. 1083 \| Cited 1 time Online Publication Date: Jul 2005 Full Text: \| Download PDF
	+ -	Show Abstract The equation of state (ES) is a subject of the greatest interest in Statistical Mechanics and Chemical Physics. In this paper we present a simple and rigorous method by which the ES of simple systems can be obtained. The derivation requires at most the knowledge of the Maxwell distribution. The well known formula for the ES of a one-dimensional system of hard rods is derived exactly, as an illustration. The method can be generalized to higher dimensionality and to include other types of potential.

Select this Article		Magnetic Moments of Two-Particle Systems John R. Urani and Gordon D. Stillie American Journal of Physics -- December 1974 -- Volume 42, Issue 12, pp. 1087 Online Publication Date: Jul 2005 Full Text: \| Download PDF
	+ -	Show Abstract Magnetic moments of atomic, molecular and nuclear systems are common topics in physics courses at all levels. In modern physics and quantum mechanics an extremely important class of problems is that of two body systems where the orbital motion of the two particles is described by a spherical harmonic wave function. The magnetic moment operator in this case is more complicated than the single particle case where L = r × p and M = (q∕2mc)L. The two particle problem is considered below in terms of the constituent angular momenta and an expression for the magnetic moment is found which is convenient to apply directly onto spherical harmonics.

Select this Article		Mathematics pre-requisites: A mastery approach Jill H. Larkin and George C. Brackett American Journal of Physics -- December 1974 -- Volume 42, Issue 12, pp. 1089 Online Publication Date: Jul 2005 Full Text: \| Download PDF
	+ -	Show Abstract To ensure that every student entering a physics course can actually use the mathematics essential for the course, we have developed a math review unit in a mastery-learning format. To complete this unit, each student must demonstrate adequate mathematics skills by passing a test. This review unit has been used in both a lecture course and in “Keller plan” courses, and it has proved manageable with a class as large as 350 students.

Select this Article		Presenting the Planck's Relation E = nhν Budh Ram American Journal of Physics -- December 1974 -- Volume 42, Issue 12, pp. 1092 Online Publication Date: Jul 2005 Full Text: \| Download PDF
	+ -	Show Abstract The theoretical discussion of the spectral distribution of black-body radiation is presented in a manner in which one “derives” the Planck relation E = nhν starting with the Planck radiation formula as empirically given. The presentation emphasizes the importance of experiment, and deductive and inductive reasoning in scientific research.

Select this Article		A PSI Astronomy Course Michael Zeilik, II American Journal of Physics -- December 1974 -- Volume 42, Issue 12, pp. 1095 \| Cited 1 time Online Publication Date: Jul 2005 Full Text: \| Download PDF
	+ -	Show Abstract This report outlines the use of Keller's Personalized System of Instruction (PSI) format for some of the students enrolled in an astronomy course for non-science specialists at Harvard University. The students in the PSI section perceived the unit tests and their immediate correction by the instructor as the most important component in their learning, and they felt strongly positive about the structured student-teacher interaction. In comparison with the student in the traditionally taught sections, the PSI students did master the material somewhat better as measured by a common final exam. The students' perceptions of PSI's educational merits guided the instructor in isolating some of the potentials and problems with PSI.

Select this Article		Competency-Based General Physics Instruction with a One-Man Staff J. L. Aubel American Journal of Physics -- December 1974 -- Volume 42, Issue 12, pp. 1101 Online Publication Date: Jul 2005 Full Text: \| Download PDF
	+ -	Show Abstract A competency-based instruction (CBI) system is one in which a student must regularly demonstrate satisfactory understanding or performance of specified competencies in order to proceed to new material. A CBI system for teaching general physics with a one man staff is outlined. Mastery and timing results are reported which suggest that for many students CBI produces more efficient learning and better student attitudes.

Select this Article		The Chemistry-Physics Program at the University of Wisconsin-Green Bay C. R. Rhyner, J. C. Norman, and F. A. Fischbach American Journal of Physics -- December 1974 -- Volume 42, Issue 12, pp. 1106 Online Publication Date: Jul 2005 Full Text: \| Download PDF
	+ -	Show Abstract The integrated chemistry-physics program at the University of Wisconsin-Green Bay is described. The structure of the University and of the academic programs are major factors in the success of the program. Observations on the relative advantages and disadvantages of this integrated approach are considered.

Select this Article		Particle Diffraction by a Single Slit as Error Propagation J. E. Purcell American Journal of Physics -- December 1974 -- Volume 42, Issue 12, pp. 1112 Online Publication Date: Jul 2005 Full Text: \| Download PDF
	+ -	Show Abstract An introductory approach to wave packet spreading is discussed which uses error propagation methods generally known to undergraduates. The specific example of particle diffraction by a single slit is used to illustrate the method. The corresponding quantum theory results are reviewed and sufficient conditions for the vanishing of a term linear in time are discussed.

Select this Article		Aligning Signals on Dual CRO Traces W. C. Elmore American Journal of Physics -- December 1974 -- Volume 42, Issue 12, pp. 1117 \| Cited 1 time Online Publication Date: Jul 2005 Full Text: \| Download PDF
		Abstract Unavailable

Select this Article		Measurement of Sound Velocities in Metal Wires Karl C. Mamola American Journal of Physics -- December 1974 -- Volume 42, Issue 12, pp. 1117 \| Cited 1 time Online Publication Date: Jul 2005 Full Text: \| Download PDF
		Abstract Unavailable

Select this Article		Why Do You Call the Innermost Atomic Electron a K Electron? Mitio Inokuti and Tetsushi Noguchi American Journal of Physics -- December 1974 -- Volume 42, Issue 12, pp. 1118 Online Publication Date: Jul 2005 Full Text: \| Download PDF
		Abstract Unavailable

Select this Article		Landau's Choice of the Critical-Point Exponent β Garrison Sposito American Journal of Physics -- December 1974 -- Volume 42, Issue 12, pp. 1119 Online Publication Date: Jul 2005 Full Text: \| Download PDF
		Abstract Unavailable

Select this Article		Comment On: “Analysis of the Free Fall Experiment” Mark A. Heald American Journal of Physics -- December 1974 -- Volume 42, Issue 12, pp. 1121 Online Publication Date: Jul 2005 Full Text: \| Download PDF
		Abstract Unavailable

Select this Article		An Optical Demonstration of Surface Plasmons on Gold A. S. Barker, jr. American Journal of Physics -- December 1974 -- Volume 42, Issue 12, pp. 1123 \| Cited 1 time Online Publication Date: Jul 2005 Full Text: \| Download PDF
		Abstract Unavailable

Select this Article		Ampère's Law in Symmetric Cases with Non-Steady-State Currents Mark A. Samuel American Journal of Physics -- December 1974 -- Volume 42, Issue 12, pp. 1126 Online Publication Date: Jul 2005 Full Text: \| Download PDF
		Abstract Unavailable

Select this Article		Spectral Distribution of Light Emitted by Various Sources—A Take-Home Experiment Walter F. Anderson, jr. American Journal of Physics -- December 1974 -- Volume 42, Issue 12, pp. 1127 Online Publication Date: Jul 2005 Full Text: \| Download PDF
		Abstract Unavailable

Select this Article		Temperature Change Correction for Constant Power Input Calorimetry Experiments G. F. Robinson American Journal of Physics -- December 1974 -- Volume 42, Issue 12, pp. 1129 Online Publication Date: Jul 2005 Full Text: \| Download PDF
		Abstract Unavailable

Select this Article		Self-Screened Charge Distributions David Stoler American Journal of Physics -- December 1974 -- Volume 42, Issue 12, pp. 1130 Online Publication Date: Jul 2005 Full Text: \| Download PDF
		Abstract Unavailable

Select this Article		Erratum: “An Introduction to Monte Carlo Methods.” [Am. J. Phys. 42, 20 (1974)] D. E. Raeside American Journal of Physics -- December 1974 -- Volume 42, Issue 12, pp. 1131 Online Publication Date: Jul 2005 Full Text: \| Download PDF
		Abstract Unavailable

Select this Article		An Equipotential Plotting Program Donald L. Shirer, Editor, D. E. Shaw, F. J. Wunderlich, and M. J. Jones American Journal of Physics -- December 1974 -- Volume 42, Issue 12, pp. 1132 Online Publication Date: Jul 2005 Full Text: \| Download PDF
		Abstract Unavailable

Select this Article		Faster Plotting Algorithm Donald L. Shirer, Editor and John E. Herman American Journal of Physics -- December 1974 -- Volume 42, Issue 12, pp. 1133 Online Publication Date: Jul 2005 Full Text: \| Download PDF
		Abstract Unavailable

Select this Article		The World of Walther Nernst: The Rise and Fall of German Science 1864–1941 K. Mendelssohn, Author and Heinrich A. Medicus, Reviewer American Journal of Physics -- December 1974 -- Volume 42, Issue 12, pp. 1135 Online Publication Date: Jul 2005 Full Text: \| Download PDF
		Abstract Unavailable

Select this Article		Modern Technical Physics Arthur Beiser, Author and T. R. Sandin, Reviewer American Journal of Physics -- December 1974 -- Volume 42, Issue 12, pp. 1136 Online Publication Date: Jul 2005 Full Text: \| Download PDF
		Abstract Unavailable

Select this Article		Short Reviews of Selected New Texts on Electronics P. A. Valberg, Reviewer American Journal of Physics -- December 1974 -- Volume 42, Issue 12, pp. 1138 Online Publication Date: Jul 2005 Full Text: \| Download PDF
		Abstract Unavailable